Drilling mechanism



Dec. 24, 1929. c. F. ossoon DRILLING MECHANISM Filed Oct. 17. 1921 2 Sheets-Sheet Dec. 24, 1929. c. F. OSGOOD DRILLING MECHANISM Filed Oct. 17, 1921 2 Sheets-Sheet 2 Patented Dec. 24, 1929 UNITED STATES PATENT OFFICE CHARLES F. OSGOOID, OF CLAREMON'I, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS DRILLING MECHANISM Application filed October 17, 1921. Serial No. 508,366.

. My invention relates to drilling mechanisms and more particularly to feeding mechanisms used in connection with pneumatically fed drilling devices.

An object of my invention is to provide an improved drilling mechanism. Another object of my invention is to provide an improved feeding mechanism for drilling motors. A further object of my invention is to provide an improved feeding mechanism for rock drills whereby a feed capacity equal to that of present devices may be obtained while the overall dimensions of the mechanism are very materially reduced. Other objects and advantages of my invention will hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustration three forms, together with a further possible modlfication, which my invention may assume in practice.

In these drawings,

Fig. 1 is a view in elevation of one form which my invention may assume in practlce.

Fig. 2 is a central longitudinal section through the feeding mechanism shown 1n Fig. 1.

Fig. 3 is an enlarged transverse section on the line 33 of Fig. 2.

Fig. 4; is a view partially in elevation and partially in section showing a modification of the foot piece of the feeding mechanism.

Fig. 5 is a view similar to Fig. 1 showing a modified form of construction.

Fig. 6 is a view partially in elevation and partially in central vertical section showing the details of construction of the feeding mechanism in Fig. 5.

Fig. 7 is a view partially in elevatlon and partially in section showing the third form which my invention may assume 1n practice.

Fig. 8 is a transverse section on l1ne 88 of Fig. 7.

For the purpose of illustration, I have shown in Figs. 1 to 3 one form which my invention may assume in practice and in this form the drilling motor is represented at 1, and is adapted to cooperate with a drill steel 2 and cause it to drill a hole into the face of the material to be worked. The supply of fluid under pressure to this motor is controlled by a valve mechanism 3 of well known form, there being a connection by way of a hose 4 with a source of pressure fluid. Mounted in alinement with the drilling motor 1 and secured thereto is a piston rod 5 having a piston 6 secured thereon. This piston 6 is slidable in a cylinder 7 which cylinder constitutes the central one of three bores, the lateral bores being designated 8 and 9 respectively, and all three bores being formed in a common casting 10. The piston rod 5 is guid ed by a bushing 11 secured in the upper end of the cylinder bore 7 while the lower end of the latter is closed by a plug 12. lVithin the bores 8 and 9 are pistons 13 and 14: respective ly, these being connected to piston rods 15 and 16 and the latter in turn being joined at their ends outside the bores 8 and 9 by a cross bar or piece 17 having an abutment engaging pin or pivot 18. If desired, the single abutment point 18'may be replaced by a pair of spaced points 18 as indicated in Fig. 4;. The handle 19 is utilized for supporting the drill and for enabling bodily rotation of the drill about the longitudinal axis of the drilling motor to effect rotation of the drill steel ac tuated by the motor. Fluid pressure is supplied under the control of the valve 8 by way of a passage 20 through the piston rod 5 and piston 6 to the lower end of the bore 7 This causes the piston 6 to feed upwardly in the bore 7 and when the latter reaches the top of this bore, by-pass passages 21 are opened, which passages communicate by ports 22 with 8 the bore 7 and by ports 23 with the extreme upper ends of the bores 8 and 9. The air accordingly next passes from the bore 7 into the bores 8 and.9 and causes the entire casting 10 to be moved upwardly thereby enabling the deepening of the hole drilled due to movement of the piston 6. In order to permit exhaust of the fluid when it is desired to collapse the feeding mechanism, the valve mechanism 3 is turned in a well known manner to connect the port 20 with the atmosphere. This will permit the weight of the drill motor to force the piston 6 downwardly and also the escape of air from the bores 8 and 9 until the ports 22 are overrun by the piston. It will be evident that the air in the 20, but the air within the bores 8 and 9 cannot be so exhausted after the ports 22 have been passed by the descending piston. I have accordingly provided auxiliary exhaust ports 24 connecting the upper ends of the bores 8 and 9 with the bore 7 which ports are closed by the periphery of the piston when the latter is in uppermost position. WVhen, however, the piston has moved below the ports 24 they are allowed to communicate with the upper end of the bore 7 and the air passing out of the bores 8 and 9 to the ports 24 may escape to the atmosphere by way of ports 25 formed in the bushing 11.

The operation will be clear from what has preceded, but to recapitulate it may be stated that the point 18 having been set upon something solid at a proper distance from the face, air is admitted to the "feed mechanism by way of valve 3 through port 20, and as tlie drilling motor causes deepening of the hole the piston 6 moves up in cylinder 7. When the piston reaches the top of its stroke ports 22 are uncovered and the air passes to cylinders 8 and 9 and causes the whole member 10 to move upwardly, increasing the feed. When it is desired to withdraw the steel, the passage 20 is vented and the weight of the drill motor causes piston 6 to move downwards. As soon as ports. 24: are opened simultaneous exhaust can take place from all the bores.

In the form of my invention shown in Figs. 5' and 6', the general construction is the same, except that in the bores 8 and 9 which are formed in the casing 10 as before there are reciprocable pistons 13 and 14' which are connected by their pistons rods 15 and 16 with the motor 1, and these are provided with passages 20 similar in function to the passage 20 of the first form of my invention. By-pass passages 21 communicating with the bore 7 adjacent its top by ports 23' and with the bores 8 and 9 by way of ports 22 at points so disposed that they are uncovered when the pistons 13 and 14 reach the tops of their strokes are arranged for the same purpose as the by-pass passages 21 in the first form of my invention, and auxiliary exhausts 24 and the vent ports 25 in bushings 11 are similarly arranged. The mode of operation of this form oi my invention is substantially identical with that shown in Figs. 1 to- 3, there being this difierence only, name- 'ly that the twin pistons first move up in their bores 8 and 9- and therefore the casting 10 moves relative to the piston 6.

In Figs. 7 and 8 I have shown a still further form which my invention may assume in practice. In this form of my invention, the motor 1 is provided with a cylinder of somewhat increased outside dimensions as indicated in the cross section shown in Fig. 8. This motor comprlses a usual cylinder 26 in which a piston 27 is reciprocable under the action of air supplied thereto under control of the valve 28. Arranged parallel to the bore 26 of the cylinder are bores 29 and 30 closed at their forward ends and having reciprocable therein pistons 31 of which but one is shown. These pistons are provided with piston rods 32 which are connected to the cross piece 33- provi-ded with a point 34. Air is supplied by suitable passages formed in the walls of the cylinder and designated 35 from the valve 28 to the upper ends ofvthe bores 29 and 30.

The mode oi operation of this form of my invention will be readily apparent, it being understood that by proper manipulation of the valve 28, air may be supplied to cause operation of the piston 27 in the bore 26 (note the passages designated 36), this-motor opera-ting on a now well known principle-, and fluid pressure by way of passages 35 may be admitted to the bores 29 and 30 and cause the cylinder member to be moved bodily toward the work while the pistonsremain stationary.

While I have in this application specifically described three forms which my invention may assume in practice, it will be understood that these forms of the the same" are shown for purposes of illustration and that the in vention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

lVhatI claim as new and desire to secure by Letters Patent is: l

1. In a drilling apparatus, a drilling motor, and fluid actuated feeding means therefor comprising parallel overlapping cylinders certain of which are arranged on opposite sides of the motor axis while another is ahned with said EIXIS, pistons contained in said cylinders including a passage extending" through one of said pistons, said passage being controlled by one of said pistons.

2. In a drilling apparatus, a drillingmotor,

and fluid actuated feeding means therefor comprising parallel overlapping cylinders certain of which are arranged on opposite sides of the motor axis and another alined with said axis, pistons contained in said cylinders, one of said pistons being connected to said motor and another of said pistons being engageable with an extraneousabutment, means for supplying fluid to or from said cylinders including a passage traversing one of said pistons, said passage also permitting'the exhaust of fluid fromone of said cylinders, and means for exhausting the fluid from another of said cylinders including a passage controlled by said piston which is connected to said motor.

3. In a drilling apparatus, adrilling-motor,

and fluid actuated feeding means therefor including a plurality of parallel cylinders arranged on opposite sides of the motor axis and a cooperating cylinder alined with said axis,

feed pistons contained in said cylinders, the

feeding effects of said cylinders and pistons being cumulative, and means for effecting serial operation of said cylinders and pistons.

4. In a drilling apparatus, a drilling motor, and fluid actuated feeding means therefor comprising parallel feed pistons and cylinders arranged on opposite sides of the motor axis, a cooperating cylinder and piston alined with said axis, one of said pistons being secured to said motor and another thereof being engageable with an extraneous abutment, and means carried by and movable with said inotor for controlling the flow of fluid to said cylinders.

5. In a drilling apparatus, a drilling motor, and fluid actuated feeding means therefor comprising a plurality of parallel feed cylinders, certain of which are arranged on 0pposite sides of the motor axis and another arranged in alinement with said axis, feed pistons contained in said cylinders, one of which is connected to said motor while another engages an extraneous abutment, said pistons having opposite relative movement, and means for supplying fluid to said cylinders to effect such movement.

6. In a drilling apparatus, a drilling motor, and fluid actuated feeding means therefor comprising a large feed piston secured to the rear end of said motor and disposed in alinement with the motor axis, a cylinder member provided with a plurality of diflerential bores, said piston being contained in one of said bores, and a plurality of small feed pistons in said other bores and arranged parallel with and at opposite sides of the motor axis, said latter pistons being adapted to react on an extraneous abutment at a point in alinement with said motor axis.

In testimony whereof I afiix my signature.

CHARLES F. OSGOOD. 

